This was under a different thread, but as I kept investigating, I figured out it is related to local settings.
When I start the document builder it faults out with:
However, it works fine on my Surface GO. This leads me to point to some sort of settings and browser control. All pop-ups are allowed, and all cookies are allowed.
What setting could be preventing Document Builder from opening?
I even listed [*.]smartsheet.com as a "Trusted Site"